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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c429d1c6e9e47d74ffccb8d72b8a2791ea8c85958b770c352acdf04b172b779' 
  AND token = 'gfJy5jjZX9kg56QcZ05stDhs/uJEoh3lBVRcHuWDiO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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