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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b31166fe16e27aff081f1232b7626bbd4d8fe51e06e55a24291da2b1a3b605' 
  AND token = 'EzCAIQMhKJZG2zMKM/MYh+GaXE6RC7LMMGCSLHtX6VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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