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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebe1b8c168b54269ca75ec1374de26017fc4bd0e6e47c418f7ccc4c12904d85' 
  AND token = 'k6a0xGVvmBAawGPOFHbB5oaErU4ECSPumHO7JFd/PgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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