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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a418db2b30580bfb1e27e0f806292e344a1d0f5d5d2e06cb6ac1f8c611ba0cf' 
  AND token = 'sBCW67otm5x3a4vFjDItk4n93+tRcVJEuw9vf5AuxbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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