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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67dbf19b89e9a742cecb8708e2ebfe847533f42b3f09564ba1d4e85d060f2d2b' 
  AND token = 'AIL7xmv4um09lNUzXd8cjybAHLFN1jGNZS4iPeMo0B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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