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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd08563f3d7d08e3e111dec85893c9e6a148356210e7c2dac09f6e2420521034' 
  AND token = 'cUZoimQgPOEhFY8t6sArfiPAFeoZ8V/rVlg6X2srW/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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