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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634e2ee56e63d8fee04fcd12a7ff0acc856759b52bfb3ef8425ba564bd19000b' 
  AND token = 'Xk5CGbcGUzoiEF7lmQc4aPwVZLm4BIKqt8WimPXx/xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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