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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0692b7d4afe9b2f7c6a59e9a1a73a9d61d5b0a9283a7b42595e1515ccd0f4bdd' 
  AND token = 'q4ZJsngZKJjMb9d/5aR3O9Ldb0nPagPFkXpd24i98h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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