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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2e5fc5710b92d05d86951cec20bef353995f1f31bae74b6d9fde7f1e65157a' 
  AND token = 'J768FazwtFhkobFufJvuhk6HE8uKVZkdrVfqJO1j2TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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