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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608a4aa851e32b86592f6f339cf550d7f81eef60fe23ef0eb06fc0d6ffd3a6a4' 
  AND token = 'HjXfhv/zcJMSR5QvA7oQswN35uoi7e0hmBr6ttXKRSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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