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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9228d9ef86e3d023583ce58a1c205f3420b951720ce655f7a2d44f1a1e48e4' 
  AND token = 'N4/2Ii/K8ZW8RnJYnZwyCCoLOvnVbAfQHGmJz90Zeuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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