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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4ed1e3193d27d4da83e1fee733ac9042796af5dbd302cd576724bae32732b4' 
  AND token = 'PEuq2Q0dkkc7Xxjoy8Waexvp86yK9V4BXg0dZFHfIwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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