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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caea8d279e30f2098d48cb731bf13e5b49740f8a983983a5714f175627743060' 
  AND token = 'JMt3K0NB0ntgVb5j9LeVEcvp4qe7B6X3CKGcJuvBlag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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