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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab17b8911e6d22107cf4a42814ae16c32d697f5c918f35416ec2f27e9f1694e' 
  AND token = 'I6nUDmkzAkKBMCXClupeKykf5/rM/RHtTFsmcQuSJ4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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