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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89a31cf8a3a74b8b9b478e2b8fdf2f8b8e77d73788f2d8c96bcf832a31b0f73' 
  AND token = 'hSd4g1JvAGlekWb3XZLipiZHwW4olUosGL9BlVg6q9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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