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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b78cd508d8400b3b85729be6c72c725f1d6aa370500dcddde542594ca00421' 
  AND token = '7inyxI63qJpWk6iGJp/GxZuHd7RD6YIMk8aFaWJNiAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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