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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fff828b635bd6809ea161a504f2a7eb004b0bb63c94f09008e50fefad7d7f4' 
  AND token = 'fABD/+OCGWRc6oJi72y2KITcq+7Tw5wmeXMVUUFyC8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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