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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d726c03064ac47e6efb507b19d96786f6dfaa0039bd4ac9ee78cd014393d5d' 
  AND token = 'WRUR1Wjwjbbq/erBhTobjlBX1sKSuluLrVe/ovj0Iig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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