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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9b8db00bdc48d4065d4e8721b216938c68f2a5dbad72cdfa35d53ce855e1f2' 
  AND token = 'R3scAdjOZoFt05ASL9qTbvkhdEAka1N4qh9BQyYVVgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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