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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f533580a29d80b92b4f844db9e90990ae2d0106a30a6e5360ae20806cd60a2' 
  AND token = 'keSCXPXna4nzbjsgB7Pwa3+9crqZ2zHHq0qxPkGgi10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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