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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31ee4aff8c85dbfb6d27bbb8b41483938090ae8ba0c00dc3d98db3e97d9c33b' 
  AND token = 'VqOMuglPd3OkvxO3VL+QBmrARtK2FlnvFMYjp+pp6QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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