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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a360004b5112030d199297df413866a5f4b420b41486e06b6cb5ddedc986fde' 
  AND token = 'xd03IB/kJhBhz2ovyN27qJhWjK/FJasmk2ecGa+5IHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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