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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fa15318c744acb7e03d33966af6759b36fd9afe149031b272475d01dcb99c0' 
  AND token = 'MUacWg/S0sIInf4IYzALCK3dgftm9lNKc+YaoAymE/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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