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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7853e4d64fa4f47a5bbc698c87054069fe972ce1d748780eb341d64f714a72' 
  AND token = 'GJw8mwEm9PMO2CQfdkVz9JGqxGvk194J+sg0o9jSTis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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