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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56e61509e5e73cf29421640e54c30a763647e5925185548d51a2b00dfb5528e' 
  AND token = 'tIg5QS2rBVoc2WrRJwAJSN1YdJ83LZhl7fF1IcSSgeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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