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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ddeda2cc1e2175f23ca7a261d75cb0ba7b31c3a1bcc76d2d8fcafa80f36705' 
  AND token = 'VvrBD5NP3T6YiAjEHTB8WcDuWtu3HP5Z5sK9jW+yFDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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