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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c23bf14f5a846837ef202d4f9c7214f20bd9f1d7f6f828fed06541877119e2' 
  AND token = '4jTBrItoWtmQXb5E3W9W/jwmYAX77Y8ljD0I+YkXoNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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