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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bfeac6b4dded779467a344d9e59d3a2034a09fa0cb8a6fa40ef0c4bcd3fc93' 
  AND token = 'UCbwc7TDmi99ZU8wDfweJkUEHrcnT9WkaYxlVm+vsKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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