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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115f34666009e70ccb63fda222694a751f8c48bbcc33b7223f1ba4ff5cba8aee' 
  AND token = 'xTrjsdwivJRU+dIWiczUx3UjZ3Q/FAxZjgbUZMsxIPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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