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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9d81a611e883e879ab7f810a438acd2ed08cefd0a89240400e883b15bcb790' 
  AND token = 'zCJEqoWAb0nCI9y1Ay2LBEiP9QmS80MN4596t4FYuMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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