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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2182f9a9e376246ae48987ef1e53891bb296225eb7aa4856df88b4d3c0a4b3' 
  AND token = 'p/Wmbg/r4iDt64QEyVGa6O90OAu/oEgZShr8UYApe6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}