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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b95f6de9517266bdc01bd7d0f5d55f8bfdbc1a82288dff315bc571cfc8223d0' 
  AND token = 'mYUOahq7i2PMka/8MlrGYPqp5GRkUeRIK0st2bjNAHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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