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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e37c2ff73bc08925a2da7ba5e30f1abf2dc2531a09dbf01d980ec4215b865f' 
  AND token = '9p1fmlg1chI7mWVxroL9znkbBVmw8z6KJzpEMWz7/Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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