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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e903b9700f6313b66a0325c8e65269350148c30a52fafff57e9c4a7dbcb78a' 
  AND token = 'Xd6R9Xz8WM71U7X/hYmcPZDWQTgkk83d3sEJF1pKwRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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