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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8f4d58b971fd4fd4e570db27448b9306a6ce37205f016c14f47c82f9240ce0' 
  AND token = '9IkjX25CCore7Vgab/H9Q3ju2sn4cVWM/qCndi2adAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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