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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9654b2f1d3c89bad472fb10e04f1007334cbaa0e09b32ec856e5c07c39bfcab0' 
  AND token = '99FW/DhLHjM0U8DATAh5vbO4YPDo619l2P+8HRRTGK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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