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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8aa6c6b0e891af6a26871cd1adc72e40cdb6fe27320a3435bb75ed122a7bf4' 
  AND token = 'k5YxZiBmQccxtLOMNwB/1gmbPctu2wmoxIkj8zSWgK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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