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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669f786fafdbaec55f45280c46cb8fcdf10c8e83ca2b8de07e2a5159eb32ccb0' 
  AND token = 'HXP81YZP5O3k2JNxctlGvHCcZxcUMMw7+aGHLXM3elg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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