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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c795318028a3dabda9ceee81434382ddb5a546cc15bd202880aea7f091efa6' 
  AND token = 'a3mRG9fiq8KSEZ6hTVPoca6ccthgmF+DVMjHY5IT9Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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