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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2176f15551ac724e69e5d67c9d8b1f1cd02aefbebf2bc5baa3c9d80f005b024e' 
  AND token = '1mU1sNugZJqlfZodj5PeXltJzDnTlbMb1O6R6h1NAJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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