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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493346536567ccab12b9b34f30d4dcef3b4240e6367497979a7ddebbea579ab3' 
  AND token = 'x0zs7XqKrihkXJ1HCuBOu0Jz7JKsMQ1bxn1eHolAQCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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