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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3e25e67e5bd3306a7bb7f069d02fbee26dbba685ee46a07a24abaa2cc8198d' 
  AND token = 'ZWX/VuWYxI38bZRWSX3L7OjK7h8F1CsUrxiP6oXY54o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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