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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e248a6d861291c9905bb039b41ccf765074f6d223288f5803a22101b967225' 
  AND token = 'RqrI8mdDpRB7TT83I6FrF+jLIGca2AhZ5ZYu4Xx1XKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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