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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76db37716c3265469f0dab804baf8e17ddbc3fecd228f3ff96849ec56b2ca0eb' 
  AND token = 'eBcBHYRw9lvO6/sK8Nnn9xqBU4n1oRss3XP/W8L9oAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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