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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54270f10ee10ff7300479944327db7ec61aa8795fe24fba4dac280e77b3115ef' 
  AND token = 'bej7nxI6JNLhVL4xHeXHo2g/VzdisBlo4qg7A6Kl7lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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