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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fba8790148fa177b9aed3991eb4e666b382696364602972e201c0ac3d93a961' 
  AND token = 'o3Ysr7Zm9KvocxBbdZboxNHLSS0scIaWHxuv522CzsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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