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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfc57837025e7833feee49c7480c0a64e681339c8fd9ab76bc2f48a55601c1e' 
  AND token = 'S0Ti0+SmN0HcqRkmNcDMYPwD3RRnzUir+ONFHOaxBRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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