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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3918d1e1bfb2d2aa339e474ecc0117f1ecf4f5538b615c0443bf76fa0364aa3' 
  AND token = 'uezX9iUs/ObKn0eGz11pAbwD3e5XWSrxw6iLb7qvAek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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