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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79a96b12615b7d7f44c8b0f582ce1c1665008868a6fc4d8a5efbf15ea56e808' 
  AND token = 'Kxp8g1HONtDb4XAALvQk49LS0B06SIiWq7KyYLUQQ+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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