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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cf017d75761a6c9189bc21c5f03b147255179fb22dd655cb981b9bc2e8d633' 
  AND token = 'I4UTVL9Q4/P/9RV5tdD0ZuDreVnnMhlBZJscsFaSDkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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