SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cff742a3b87fa328b2378590f6a37d96b9a2effdea993e74f6659c58b8388c3' 
  AND token = '8WuqOh/IBB2emdN0gFYXuRSPVSkwl+inhvFHB+x4+2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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