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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3b2b235518fef4f71bcc123cad9305b88acb96b98a700cd052b9137eba9c7f' 
  AND token = 'SE7WlwV23V+mMzdk8Q02J5LAjX4tS4y27zHI2t2zWvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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