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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94ebff235af6f5b4e6973a27fa248ac1078e562cc0792953b55920d61f97256' 
  AND token = 'eM2yvYSlDUA7KpGU0/A3uRSvUNv5mO9Mmf0XSQ5w/3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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