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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923c8acace9282661001944a7c3cc9ce754dda7583de2aa85d08163fb01e8a2a' 
  AND token = 'u/DWcnnwTdYq992zfB50SyKaID+eWyK5QR5oyLMeO8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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