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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c638cc8b21c014cf33a07c8bd4bd7564a47fce54cdffd1eb9d74d750756ccdb5' 
  AND token = 'GxYVsfsRQLnM1FnYB3usj04/x7uWzXVmVev0XSgfFkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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