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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b230add7e154c0231ebcf898c6e2186b7789088c7d98c30b684775ddc61d56d' 
  AND token = 'tqIt9hLv0HI8LsXx0qxpkabn78t5e8oLt9/j4aTrJaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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