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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a2413e4f59523bd0e6670cdf90f27372ef159c04dc804f6dafa846c85a9467' 
  AND token = 'I8/5mrXcDFe4BwqhwZsoW1kllx63MQLSvSM7o2f9ywQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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